English 中文(简体)
文本长度等于检查
原标题:Text Length equal to checking

我有一个简单的问题。 我有一个文本字段, 它更新并填满了字符, 当字符长度为12( 12) 时, 我想执行动作。 例如, 当长度为 12 (12) 时, 我想要它做一些事情, 当长度为 24 时, 等等 。

我能做点什么吗?

if (textfield.text.length == 12){
//do something
}

希望有人能帮助我:)

感谢 谢谢

最佳回答

您应该使用该代表

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

如果你在大地上造化了自己,那末,你们可以使用它;如果你们在大地上造化了自己,就像在大地上造化了自己一样;

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    if (textfield.text.length == 12){
    //do something
    }
}
问题回答

设置 < code> UIText FieldDelegate 并落实 < code> text Frield:should ChangeCharactersInRange: replacementString: 方法。计算一旦应用 replacementString ,文本字段将包含什么内容, 并按您需要做, 如果它与您正在查找的内容相符 。

请注意,这也要求删除和粘贴事件。

写下此代码 :

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string 
{
    if (textfield.text.length == 12)
       {
           condition......
       }
    else if (textfield.text.length == 24)
       {
           condition......
       }
    else
       {
           condition......
       }
}




相关问题
How to change out-of-focus text selection color in Xcode?

Okay, I ll bite. I ve got really pleasant code/window colors set up in Xcode. Ordinarily, my selection color is very visible. When I am doing a project search and iterating through the results, ...

Iphone NSTimer Issue

Hi I am new to objective c. I am trying to make an app for iphone. I have a button on my view, and the click on which the function playSound is called. This is working properly. It does plays the ...

Include a .txt file in a .h in C++?

I have a number of places where I need to re-use some template code. Many classes need these items In a .h could I do something like: #include <xxx.txt> and place all of this code in the ....

Iterating over string/strlen with umlauted characters

This is a follow-up to my previous question . I succeeded in implementing the algorithm for checking umlauted characters. The next problem comes from iterating over all characters in a string. I do ...

Xcode open two editor windows with same file

Is it possible to open the same file in two separate windows in Xcode. I can open a file in one window and the same file in the main Xcode editor window, but I wanted two separate fulltime editor ...

Forcing code signing refresh in Xcode

In our environment, we share resources across multiple projects and platforms. When building for iPhone, only a subset of those resources are needed. Since that subset is still considerable, we have ...

热门标签